{"id":41300,"date":"2022-01-04T20:05:22","date_gmt":"2022-01-04T14:35:22","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=41300"},"modified":"2022-02-04T12:39:23","modified_gmt":"2022-02-04T07:09:23","slug":"biology-mcqs-with-answers-class-12-principles-of-inheritance-and-variation","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/study-materials\/biology-mcqs\/class-12\/chapter-5-principles-of-inheritance-and-variation\/","title":{"rendered":"Biology MCQs with Answers &#8211; Class 12 Principles of Inheritance and Variation"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_37 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><label for=\"item\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input type=\"checkbox\" id=\"item\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' style='display:block'><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/biology-mcqs\/class-12\/chapter-5-principles-of-inheritance-and-variation\/#Biology_MCQs_with_Answers\" title=\"Biology MCQs with Answers\">Biology MCQs with Answers<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/biology-mcqs\/class-12\/chapter-5-principles-of-inheritance-and-variation\/#Principles_of_Inheritance_and_Variation\" title=\"Principles of Inheritance and Variation\">Principles of Inheritance and Variation<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Biology_MCQs_with_Answers\"><\/span>Biology MCQs with Answers<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Get Multiple Choice Questions with Answers for Class 12 Biology on Infinity Learn for free.<\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Principles_of_Inheritance_and_Variation\"><\/span>Principles of Inheritance and Variation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Question 1.<br \/>\nIf a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is<br \/>\n(a) autosomal dominant<br \/>\n(b) autosomal recessive<br \/>\n(c) sex-linked dominant<br \/>\n(d) sex-linked recessive.<br \/>\nAnswer:<br \/>\n(d) sex-linked recessive.<\/p>\n<p>&nbsp;<\/p>\n<p>Question 2.<br \/>\nIn sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplets codes for valine ?<br \/>\n(a) GGG<br \/>\n(b) A AG<br \/>\n(c) G A A<br \/>\n(d) GUG<br \/>\nAnswer:<br \/>\n(d) GUG<\/p>\n<p>&nbsp;<\/p>\n<p>Question 3.<br \/>\nPerson having genotype IA IB would show the blood group as AB. This is because of<br \/>\n(a) pleiotropy<br \/>\n(b) co-dominance<br \/>\n(c) segregation<br \/>\n(d) incomplete dominance.<br \/>\nAnswer:<br \/>\n(b) co-dominance<\/p>\n<p>&nbsp;<\/p>\n<p>Question 4.<br \/>\nZZ\/ZW type of sex determination is seen in<br \/>\n(a) platypus<br \/>\n(b) snails<br \/>\n(c) cockroach<br \/>\n(d) peacock<br \/>\nAnswer:<br \/>\n(d) peacock<\/p>\n<p>&nbsp;<\/p>\n<p>Question 5.<br \/>\nA cross between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parents ?<br \/>\n(a) TT and Tt<br \/>\n(b) Tt and Tt<br \/>\n(c) TT and TT<br \/>\n(d) Tt and It<br \/>\nAnswer:<br \/>\n(b) TtandTt<\/p>\n<p>&nbsp;<\/p>\n<p>Question 6.<br \/>\nIn a dihybrid cross, if you get 9 : 3 : 3 : 1 ratio it denotes that<br \/>\n(a) the alleles of two genes are interacting with each other<br \/>\n(b) it is a multigenic inheritance<br \/>\n(c) it is a case of multiple allelism<br \/>\n(d) the alleles of two genes are segregating independently.<br \/>\nAnswer:<br \/>\n(d) the alleles of two genes are segregating independently.<\/p>\n<p>&nbsp;<\/p>\n<p>Question 7.<br \/>\nWhich of the following will not result in variations among siblings ?<br \/>\n(a) Independent assortment of genes<br \/>\n(b) Crossing over<br \/>\n(c) Linkage<br \/>\n(d) Mutation<br \/>\nAnswer:<br \/>\n(c) Linkage<\/p>\n<p>&nbsp;<\/p>\n<p>Question 8.<br \/>\nMendel\u2019s Law of independent assortment holds good for genes situated on the<br \/>\n(a) non-homologous chromosomes<br \/>\n(b) homologous chromosomes<br \/>\n(c) extra nuclear genetic element<br \/>\n(d) same chromosome.<br \/>\nAnswer:<br \/>\n(b) homologous chromosomes<\/p>\n<p>&nbsp;<\/p>\n<p>Question 9.<br \/>\nOccasionally, a single gene may express more than one effect. The phenomenon is called<br \/>\n(a) multiple allelism<br \/>\n(b) mosaicism<br \/>\n(c) pleiotropy<br \/>\n(d) polygeny.<br \/>\nAnswer:<br \/>\n(c) pleiotropy<\/p>\n<p>&nbsp;<\/p>\n<p>Question 10.<br \/>\nIn the F2 generation of a Mendelian dihybrid cross the number of phenotypes and genotypes are<br \/>\n(a) phenotypes \u2013 4; genotypes \u2013 16<br \/>\n(b) phenotypes \u2013 9; genotypes \u2013 4<br \/>\n(c) phenotypes \u2013 4; genotypes \u2013 8<br \/>\n(d) phenotypes \u2013 4; genotypes \u2013 9.<br \/>\nAnswer:<br \/>\n(d) phenotypes \u2013 4; genotypes \u2013 9.<\/p>\n<p>&nbsp;<\/p>\n<p>Question 11.<br \/>\nThe colour based contrasting traits in seven contrasting pairs, studied by Mendel in pea plant were<br \/>\n(a) 1<br \/>\n(b) 2<br \/>\n(c) 3<br \/>\n(d) 4<br \/>\nAnswer:<br \/>\n(c) 3<\/p>\n<p>&nbsp;<\/p>\n<p>Question 12.<br \/>\n_________ pairs of contrasting traits were studied by Mendel in pea plant.<br \/>\n(a) 6<br \/>\n(b) 7<br \/>\n(c) 8<br \/>\n(d) 10<br \/>\nAnswer:<br \/>\n(b) 7<\/p>\n<p>&nbsp;<\/p>\n<p>Question 13.<br \/>\nWhich of the following characters was not chosen by Mendel ?<br \/>\n(a) Pod shape<br \/>\n(b) Pod colour<br \/>\n(c) Location of flower<br \/>\n(d) Location of pod<br \/>\nAnswer:<br \/>\n(d) Location of pod<\/p>\n<p>&nbsp;<\/p>\n<p>Question 14.<br \/>\nGenes which code for a pair of contrasting traits are known as<br \/>\n(a) dominant genes<br \/>\n(b) alleles<br \/>\n(c) linked genes<br \/>\n(d) none of these<br \/>\nAnswer:<br \/>\n(b) alleles<\/p>\n<p>&nbsp;<\/p>\n<p>Question 15.<br \/>\nA recessive allele is expressed in<br \/>\n(a) heterozygous condition only<br \/>\n(b) homozygous condition only<br \/>\n(c) F3 generation<br \/>\n(d) both homozygous and heterozygous conditions.<br \/>\nAnswer:<br \/>\n(b) homozygous condition only<\/p>\n<p>&nbsp;<\/p>\n<p>Question 16.<br \/>\nThe characters which appear in the first filial generation are called<br \/>\n(a) recessive characters<br \/>\n(b) dominant characters<br \/>\n(c) holandric characters<br \/>\n(d) lethal characters<br \/>\nAnswer:<br \/>\n(b) dominant characters<\/p>\n<p>&nbsp;<\/p>\n<p>Question 17.<br \/>\nWhat will be the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus ?<br \/>\n(a) 3 : 1<br \/>\n(b) 1 : 2 : 1<br \/>\n(c) 1 : 1<br \/>\n(d) None of these<br \/>\nAnswer:<br \/>\n(c) 1 : 1<\/p>\n<p>&nbsp;<\/p>\n<p>Question 18.<br \/>\nIn a monohybrid cross between two heterozygous individuals, percentage of pure homozygous individuals obtained in F<sub>1<\/sub> generation will be<br \/>\n(a) 25 %<br \/>\n(b) 50 %<br \/>\n(c) 75 %<br \/>\n(d) 100 %<br \/>\nAnswer:<br \/>\n(b) 50 %<\/p>\n<p>&nbsp;<\/p>\n<p>Question 19.<br \/>\nWhat is the probability of production of dwarf offsprings in a cross betweeen two heterozygous tall pea plants ?<br \/>\n(a) Zero<br \/>\n(b) 50 %<br \/>\n(c) 25 %<br \/>\n(d) 100 %<br \/>\nAnswer:<br \/>\n(c) 25 %<\/p>\n<p>&nbsp;<\/p>\n<p>Question 20.<br \/>\nWhich of the following crosses will give tall and dwarf pea plants in same proportions ?<br \/>\n(a) TT \u00d7 tt<br \/>\n(b) Tt \u00d7 tt<br \/>\n(c) TT \u00d7 Tt<br \/>\n(d) tt \u00d7 tt<br \/>\nAnswer:<br \/>\n(b) Tt \u00d7 tt<\/p>\n<p>&nbsp;<\/p>\n<p>Question 21.<br \/>\nWhich of the following is incorrect regarding ZW \u2013 ZZ type of sex determination ?<br \/>\n(a) It occurs in birds and some reptiles.<br \/>\n(b) Females are homogametic and males are heterogametic.<br \/>\n(c) 1:1 sex ratio is produced in the offsprings.<br \/>\n(d) All of these<br \/>\nAnswer:<br \/>\n(b) Females are homogametic and males are heterogametic.<\/p>\n<p>&nbsp;<\/p>\n<p>Question 22.<br \/>\nA couple has six daughters. What is the possibility of their having a girl next time ?<br \/>\n(a) 10 %<br \/>\n(b) 50 %<br \/>\n(c) 90 %<br \/>\n(d) 100 %<br \/>\nAnswer:<br \/>\n(b) 50 %<\/p>\n<p>&nbsp;<\/p>\n<p>Question 23.<br \/>\nNumber of autosomes present in liver cells of a human female is<br \/>\n(a) 22 autosomes<br \/>\n(b) 22 pairs<br \/>\n(c) 23 autosomes<br \/>\n(d) 23 pairs<br \/>\nAnswer:<br \/>\n(b) 22 pairs<\/p>\n<p>&nbsp;<\/p>\n<p>Question 24.<br \/>\nHaplodiploidy is found in<br \/>\n(a) grasshoppers and cockroaches<br \/>\n(b) birds and reptiles<br \/>\n(c) butterflies and moths<br \/>\n(d) honeybees, ants and waspe.<br \/>\nAnswer:<br \/>\n(d) honeybees, ants and waspe.<\/p>\n<p>&nbsp;<\/p>\n<p>Question 25.<br \/>\nRate of mutation is affected by<br \/>\n(a) temperature<br \/>\n(b) X-rays<br \/>\n(c) gamma rays<br \/>\n(d) all of these.<br \/>\nAnswer:<br \/>\n(d) all of these.<\/p>\n<p>&nbsp;<\/p>\n<p>Question 26.<br \/>\nTwo or more independent genes present on different chromosomes which determine nearly same phenotype are called<br \/>\n(a) supplementary genes<br \/>\n(b) complementary genes<br \/>\n(c) duplicate genes<br \/>\n(d) none of these.<br \/>\nAnswer:<br \/>\n(c) duplicate genes<\/p>\n<p>&nbsp;<\/p>\n<p>Question 27.<br \/>\nSelect the incorrect statement regarding pedigree analysis.<br \/>\n(a) Solid symbols show unaffected individuals.<br \/>\n(b) Proband is the person from which case history starts.<br \/>\n(c) It is useful for genetic counsellors.<br \/>\n(d) It is an analysis of traits in several generations of a family.<br \/>\nAnswer:<br \/>\n(a) Solid symbols show unaffected individuals.<\/p>\n<p>&nbsp;<\/p>\n<p>Question 28.<br \/>\nTo determine the genotype of a tall plant of F<sub>2<\/sub> generation, Mendel crossed this plant with a dwarf plant. This cross represents a<br \/>\n(a) test cross<br \/>\n(b) back cross<br \/>\n(c) reciprocal cross<br \/>\n(d) dihybrid cross.<br \/>\nAnswer:<br \/>\n(a) test cross<\/p>\n<p>&nbsp;<\/p>\n<p>Question 29.<br \/>\nWhich of the following is a test cross ?<br \/>\n(a) TT \u00d7 TT<br \/>\n(b) Tt \u00d7 Tt<br \/>\n(c) tt \u00d7 tt<br \/>\n(d) Tt \u00d7 tt<br \/>\nAnswer:<br \/>\n(d) Tt \u00d7 tt<\/p>\n<p>&nbsp;<\/p>\n<p>Question 30.<br \/>\nMendal formulated the law of purity of gametes on the basis of<br \/>\n(a) monohybrid cross<br \/>\n(b) dihybrid cross<br \/>\n(c) test cross<br \/>\n(d) back cross.<br \/>\nAnswer:<br \/>\n(a) monohybrid cross<\/p>\n<p>&nbsp;<\/p>\n<p>Question 31.<br \/>\nThe inheritance of flower colour in Antirrhinum (dog flower) is an example of<br \/>\n(a) incomplete dominance<br \/>\n(b) co-dominance<br \/>\n(c) multiple alleles<br \/>\n(d) linkage.<br \/>\nAnswer:<br \/>\n(a) incomplete dominance<\/p>\n<p>&nbsp;<\/p>\n<p>Question 32.<br \/>\nIn Antirrhinum (dog flower), phenotypic ratio in F<sub>2<\/sub> generation for the inheritance of flower colour would be<br \/>\n(a) 3 : 1<br \/>\n(b) 1 : 2 : 1<br \/>\n(c) 1 : 1<br \/>\n(d) 2 : 1<br \/>\nAnswer:<br \/>\n(b) 1 : 2 : 1<\/p>\n<p>&nbsp;<\/p>\n<p>Question 33.<br \/>\nPhenotypic and genotypic ratio is similar in case of<br \/>\n(a) complete dominance<br \/>\n(b) incomplete dominance<br \/>\n(c) over dominance<br \/>\n(d) epistasis.<br \/>\nAnswer:<br \/>\n(b) incomplete dominancec<\/p>\n<p>&nbsp;<\/p>\n<p>Question 34.<br \/>\nWhat can be the blood group of offspring when both parents have AB blood group ?<br \/>\n(a) AB only<br \/>\n(b) A, B and AB<br \/>\n(c) A, B, AB and O<br \/>\n(d) A and B only<br \/>\nAnswer:<br \/>\n(b) A, B and AB<\/p>\n<p>&nbsp;<\/p>\n<p>Question 35.<br \/>\nInheritance of roan coat in cattle is an example of<br \/>\n(a) incomplete dominance<br \/>\n(b) codominance<br \/>\n(c) multiple allelism<br \/>\n(d) none of these<br \/>\nAnswer:<br \/>\n(b) codominance<\/p>\n<p>&nbsp;<\/p>\n<p>Question 36.<br \/>\nABO blood grouping in human beings cites the example of<br \/>\n(a) incomplete dominance<br \/>\n(b) co-dominance<br \/>\n(c) multiple allelism<br \/>\n(d) both<br \/>\n(b) and (c)<br \/>\nAnswer:<br \/>\n(b) and (c)<\/p>\n<p>&nbsp;<\/p>\n<p>Question 37.<br \/>\nIn mice, Y is the dominant allele for yellow fur an y is the recessive allele for grey fur. Since Y is lethal when homozygous, the result of cross Yy \u00d7 Yy will be<br \/>\n(a) 3 yellow : 1 grey<br \/>\n(b) 2 yellow : 1 grey<br \/>\n(c) 1 yellow : 1 grey<br \/>\n(d) 1 yellow : 2 grey<br \/>\nAnswer:<br \/>\n(b) 2 yellow : 1 grey<\/p>\n<p>&nbsp;<\/p>\n<p>Question 38.<br \/>\nHow many types of gametes can be produced by a diploid organism who is heterozygous for 4 loci ?<br \/>\n(a) 4<br \/>\n(b) 8<br \/>\n(c) 16<br \/>\n(d) 32<br \/>\nAnswer:<br \/>\n(c) 16<\/p>\n<p>&nbsp;<\/p>\n<p>Question 39.<br \/>\nWhich of the following is correct for the condition when plant YyRr is back crossed with the double recessive parent ?<br \/>\n(a) 9 : 3 : 3 : 1 ratio of phenotypes only<br \/>\n(b) 9 : 3 : 3 : 1 ratio of genotypes only<br \/>\n(c) 1 : 1 : 1 : 1 ratio of phenotypes only<br \/>\n(d) 1 : 1 : 1 : 1 ratio of phenotypes and genotypes<br \/>\nAnswer:<br \/>\n(d) 1 : 1 : 1 : 1 ratio of phenotypes and genotypes<\/p>\n<p>&nbsp;<\/p>\n<p>Question 40.<br \/>\nLaw of independent assortment can be explained with the help of<br \/>\n(a) dihybrid<br \/>\n(b) test cross<br \/>\n(c) back cross<br \/>\n(d) monohybrid cross<br \/>\nAnswer:<br \/>\n(a) dihybrid<\/p>\n<p>&nbsp;<\/p>\n<p>Question 41.<br \/>\nMendel\u2019s work was rediscovered by three scientists in the year<br \/>\n(a) 1865<br \/>\n(b) 1900<br \/>\n(c) 1910<br \/>\n(d) 1920<br \/>\nAnswer:<br \/>\n(b) 1900<\/p>\n<p>&nbsp;<\/p>\n<p>Question 42.<br \/>\nWhich three scientists independently rediscovered Mendel\u2019s work ?<br \/>\n(a) Avery, McLeod, McCarty<br \/>\n(b) Sutton, Morgan and Bridges<br \/>\n(c) Bateson, Punnet and Bridges<br \/>\n(d) de Vries, Correns and Tschemark<br \/>\nAnswer:<br \/>\n(d) de Vries, Correns and Tschemark<\/p>\n<p>&nbsp;<\/p>\n<p>Question 43.<br \/>\nChromosomal theory of inheritance was given by<br \/>\n(a) Morgan et al<br \/>\n(b) Sutton and Boveri<br \/>\n(c) Hugo deVries<br \/>\n(d) Gregor J. Mendel<br \/>\nAnswer:<br \/>\n(b) Sutton and Boveri<\/p>\n<p>&nbsp;<\/p>\n<p>Question 44<br \/>\nExperimental verification of \u2018chromosomal theory of inheritance\u2019 was done by<br \/>\n(a) Sutton and Boveri<br \/>\n(b) Morgan et al<br \/>\n(c) Henking<br \/>\n(d) Karl Correns.<br \/>\nAnswer:<br \/>\n(b) Morgan et al<\/p>\n<p>&nbsp;<\/p>\n<p>Question 45.<br \/>\nGenes located very close to one another on same chromosome tend to be transmitted together and are called as<br \/>\n(a) allelomorphs<br \/>\n(b) identical genes<br \/>\n(c) linked genes<br \/>\n(d) recessive genes<br \/>\nAnswer:<br \/>\n(c) linked genes<\/p>\n<p>&nbsp;<\/p>\n<p>Question 46.<br \/>\nWhat is true about the crossing over between linked genes ?<br \/>\n(a) No crossing over at all<br \/>\n(b) High percentage of crossing over<br \/>\n(c) Hardly any crossing over<br \/>\n(d) None of these<br \/>\nAnswer:<br \/>\n(c) Hardly any crossing over<\/p>\n<p>&nbsp;<\/p>\n<p>Question 47.<br \/>\nChromosome maps\/genetic maps were first prepared by<br \/>\n(a) Sutton and Boveri (1902)<br \/>\n(b) Bateson and Punnett (1906)<br \/>\n(c) Morgan (1910)<br \/>\n(d) Sturtevant (1911)<br \/>\nAnswer:<br \/>\n(d) Sturtevant (1911)<\/p>\n<p>&nbsp;<\/p>\n<p>Question 48.<br \/>\nThe distance between the genes is measured by<br \/>\n(a) angstrom<br \/>\n(b) map unit<br \/>\n(c) Dobson unit<br \/>\n(d) millimetre<br \/>\nAnswer:<br \/>\n(c) Dobson unit<\/p>\n<p>&nbsp;<\/p>\n<p>Question 49.<br \/>\nWhich of the following is suitable for experiment on linkage ?<br \/>\n(a) aaBB x aaBB<br \/>\n(b) AABB x aabb<br \/>\n(c) AaBb x AaBb<br \/>\n(d) AAbb x AaBB<br \/>\nAnswer:<br \/>\n(b) AABB x aabb<\/p>\n<p>&nbsp;<\/p>\n<p>Question 50.<br \/>\nMendel\u2019s law of independent assortment does not hold true for the genes that are located closely on<br \/>\n(a) same chromosome<br \/>\n(b) non-homologous chromosomes<br \/>\n(c) X-chromosome<br \/>\n(d) autosomes<br \/>\nAnswer:<br \/>\n(a) same chromosome<\/p>\n<p>&nbsp;<\/p>\n<p>Question 51.<br \/>\nIf linkage was known at the time of Mendel then which of the following laws, he would not have been able to explain ?<br \/>\n(a) Law of dominance<br \/>\n(b) Law of independent assortment<br \/>\n(c) Law of segregation<br \/>\n(d) Law of purity of gametes<br \/>\nAnswer:<br \/>\n(b) Law of independent assortment<\/p>\n<p>&nbsp;<\/p>\n<p>Question 52.<br \/>\nWhich of the following are reasons for Mendel\u2019s success ?<br \/>\n(i) Usage of pure lines or pure breeding varieties<br \/>\n(ii) Consideration of one character at a time<br \/>\n(iii) Maintenance of statistical records of experiments<br \/>\n(iv) Knowledge of linkage and incomplete dominance<br \/>\n(a) (i) and (ii) only<br \/>\n(b) (i), (ii) and (iii)<br \/>\n(c) (i) and (iv) only<br \/>\n(d) (ii), (iii) and (iv)<br \/>\nAnswer:<br \/>\n(b) (i), (ii) and (iii)<\/p>\n<p>&nbsp;<\/p>\n<p>Question 53.<br \/>\nXO type of sex determination and XY type of sex determination are the examples of<br \/>\n(a) male heterogamety<br \/>\n(b) female heterogamety<br \/>\n(c) male homogamety<br \/>\n(d) both (b) and (c)<br \/>\nAnswer:<br \/>\n(a) male heterogamety<\/p>\n<p>&nbsp;<\/p>\n<p>Question 54.<br \/>\nGrasshopper is an example of XO type of sex determination in which the males have<br \/>\n(a) one X chromosome<br \/>\n(b) one Y chromosome<br \/>\n(c) two X chromosomes<br \/>\n(d) no X chromosome<br \/>\nAnswer:<br \/>\n(a) one X chromosome<\/p>\n<p>&nbsp;<\/p>\n<p>Question 55.<br \/>\nIn XO type of sex determination<br \/>\n(a) females produce two different types of gametes<br \/>\n(b) males produce two different types of gametes<br \/>\n(c) females produce gametes with Y chromosome<br \/>\n(d) males produce gametes with Y chromosome.<br \/>\nAnswer:<br \/>\n(b) males produce two different types of gametes<\/p>\n<p>&nbsp;<\/p>\n<p>Question 56.<br \/>\nIf both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child ?<br \/>\n(a) 25 %<br \/>\n(b) 100 %<br \/>\n(c) No chance<br \/>\n(d) 50 %<br \/>\nAnswer:<br \/>\n(a) 25 %<\/p>\n<p>&nbsp;<\/p>\n<p>Question 57.<br \/>\nSelect the disease which is caused by recessive autosomal genes when present in homozygous conditions.<br \/>\n(a) Alkaptonuria<br \/>\n(b) Albinism<br \/>\n(c) Cystic fibrosis<br \/>\n(d) All of these<br \/>\nAnswer:<br \/>\n(d) All of these<\/p>\n<p>&nbsp;<\/p>\n<p>Question 58.<br \/>\nWhich of the following trait is controlled by dominant autosomal genes ?<br \/>\n(a) Polydactyly<br \/>\n(b) Huntington\u2019s chorea<br \/>\n(c) PTC (phenylthiocarbamide) tasting<br \/>\n(d) All of these<br \/>\nAnswer:<br \/>\n(d) All of these<\/p>\n<p>&nbsp;<\/p>\n<p>Question 59.<br \/>\nFailure of segregation of chromatids during cell division results in the gain or loss of chromosomes, this is called as<br \/>\n(a) euploidy<br \/>\n(b) monoploidy<br \/>\n(c) aneuploidy<br \/>\n(d) polyploidy<br \/>\nAnswer:<br \/>\n(c) aneuploidy<\/p>\n<p>&nbsp;<\/p>\n<p>Question 60.<br \/>\nTrisomy is represented by<br \/>\n(a) (2n \u2013 1)<br \/>\n(b) (2n \u2013 2)<br \/>\n(c) (2n + 2)<br \/>\n(d) (2n + 1)<br \/>\nAnswer:<br \/>\n(d) (2n + 1)<\/p>\n<p>&nbsp;<\/p>\n<p>Question 61.<br \/>\nMongolism is a genetic disorder which is caused by the presence of an extra chromosome number<br \/>\n(a) 20<br \/>\n(b) 21<br \/>\n(c) 17<br \/>\n(d) 23<br \/>\nAnswer:<br \/>\n(b) 21<\/p>\n<p>&nbsp;<\/p>\n<p>Question 62.<br \/>\nKlinefelter\u2019s syndrome is characterised by a karyotype of<br \/>\n(a) XYY<br \/>\n(b) XO<br \/>\n(c) XXX<br \/>\n(d) XXY<br \/>\nAnswer:<br \/>\n(d) XXY<\/p>\n<p>&nbsp;<\/p>\n<p>Question 63.<br \/>\nThis abnormality occurs due to monosomy (2n \u2013 1); the individual has 2n = 45 chromosomes with 44 + XO genotype.<br \/>\n(a) Edward\u2019s syndrome<br \/>\n(b) Down\u2019s syndrome<br \/>\n(c) Turner\u2019s syndrome<br \/>\n(d) Klinefelter\u2019s syndrome<br \/>\nAnswer:<br \/>\n(c) Turner\u2019s syndrome<\/p>\n<p>&nbsp;<\/p>\n<p>Question 64.<br \/>\nFemales with Turner\u2019s syndrome have<br \/>\n(a) small uterus<br \/>\n(b) rudimentary ovaries<br \/>\n(c) underdeveloped breasts<br \/>\n(d) all of these.<br \/>\nAnswer:<br \/>\n(d) all of these.<\/p>\n<p>&nbsp;<\/p>\n<p>Question 65.<br \/>\nAll genes located on the same chromosome<br \/>\n(a) form different groups depending upon their relative distance<br \/>\n(b) form one linkage group<br \/>\n(c) will not from any linkage groups<br \/>\n(d) form interactive groups that affect the phenotype.<br \/>\nAnswer:<br \/>\n(b) form one linkage group<\/p>\n<p>&nbsp;<\/p>\n<p>Question 66.<br \/>\nConditions of a karyotype 2n\u00b1l and 2n + 2 are called<br \/>\n(a) aneuploidy<br \/>\n(b) polyploidy<br \/>\n(c) allopolyploidy<br \/>\n(d) monosomy.<br \/>\nAnswer:<br \/>\n(a) aneuploidy<\/p>\n<p>&nbsp;<\/p>\n<p>Question 67.<br \/>\nDistance between the genes and percentage of recontbfnatidnshows<br \/>\n(a) a direct relationship<br \/>\n(b) an inverse relationship<br \/>\n(c) a parallel relationship<br \/>\n(d) no relationship.<br \/>\nAnswer:<br \/>\n(a) a direct relationship<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Biology MCQs with Answers Get Multiple Choice Questions with Answers for Class 12 Biology on Infinity Learn for free. &nbsp; [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"Biology MCQs with Answers - Class 12 Principles of Inheritance and Variation","_yoast_wpseo_metadesc":"Get Multiple Choice Questions with Answers for Class 12 Biology on Infinity Learn for free.","custom_permalink":"study-materials\/biology-mcqs\/class-12\/chapter-5-principles-of-inheritance-and-variation\/"},"categories":[92,93,21],"tags":[],"table_tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO 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